Dressing of individual blocks of stone



Jn-.15, 1940- o. w. BURKHARDT 2,187,299

' DRESSING 0F INDIVIDUAL BLOCKS OF STONE Filed June l, 1957 for:

2 Sheets-Sheet 1 Jan. 16, 1940. o. w. BURKHARDT DRESSING 0F INDIVIDUALBLOCKS OF STONE Filed June 1, 1937 2 Sheets-Sheet `2 Patented jan. 16" 11 f 15 bridge, tnatrtni 1pwer111saw; 11which1ismc1mer "arranged atanfanggto one another the method 15 stone at the Sametime; and

1 "55 procedure is continued until `the block of stone 1`1The lateralslide n (Figure 1) carries a casing `55 1 1 'UNITED' STATES OFFICE,

1 1 0tto"Wilhelm Burkhardt, Bayreuth," Germany 1 11 11 11 1 applicati@June 1 1,1 1937, seria1N0.1145,899 11 1 1 Germany August 13511111935 z;f

11 1 1 1 11 i 1 "1 1 r 1 11:o11a1m`-111 V(c1. 12s-13V1 1 1 1 1 1 1 1 A 1"11 "1 This inventionrelatesto 1ame1thodjof dressing11 iscompletelydressed on `this side,` and a smooth 1 blocksfof 11stone1 by11t1he11scp-called crust-cutting 1 'andsatisfactory sidesurfaceobtained. 1` 1 1 1 process by means or circular saws, and toappa-11 The circularsaw 1q workfng in vertical di- 1 ratus serving forcarrying outthe meth`od`.`1V ;`1111ecti`on1is somounteduponits spindlethat the 1551 According1` to the; invention the dressingwof end :c1ofthe spindle lies behind the `plane ofthe -5 stoneblocks bycrust-cuttingis effected in such `1sawpblade q. V111The other circularsaw t is soar- 1 a1wa`y thatby meansfof simultaneously cutting ranged atanobtuse angle to the saw q that the circular1111saws,1arranged at anangle to one 1` `a n1 11 fsawblade directed upwards `towards the stone 11 otherin a manner known in itself, thcrust is 11'1blockfroxn`be11o`w; 11 1 1 1 1 1` glorernoved in111strips, thus forming plane surfaces.11AMlin the1111cr`1111st-cutting the lower saw t isin ad- 10 1 For thispurpose there serves apparatusinjwhich vance ofthe vertically workingsaw-q, and works circular saws arranged at an angle tof one another1` 1at the level 11`t1h1at corresponds to the spacing of .are so supportedon 1a carriag`e,1which is hori-` 1 the cuts eachtime,11

1.1zontally1` movable 11on] a1 vertically adjustabley1 11111n'stad1ofWorkngwith two circular "saws leads the vertical 11s`a1w, inthe cuttingdirection.` according tothelinvention may also be carried 1 11111111Thecircular saw working in a verticaldirection,1 .'outfwithyone circularj11s1a`w; `which is pivotally f Vis1 sorconstructed1'that11its1"spindle, onthe side 11` arrangedin amannerknownin itself. In this facing 1 he stone, does `1"nct` project beyond fthecasethe1 process isfjsubdividedinto two stages, 201-1p1aneoflthgsawblgde, 1 insuch a 1way1tl11at `111st,`\`1vith the saw blade in-20 `1 QByl means 1ofthe `method andthe apparatus Clle'l,` auth@ inclinedHCSDS A11A2,`1A31 land 1 according to -the invention, the {crusts'1even1 of 1 so lforth located 1one under another are executed,` 1 111very, large 1work-pieces`1can beserved by`circular @and then.W131h1`i1hejsawblade swung into a ver- '1 jsaws 1 of; comparatively11small 1 diameter by 1cqn- 11 ticalposition, the vertijcalcleavage cutsB, B1,B2 1 25 tinuousremoval inlayers.1 Completely planeside eldSo-Qn,"111 1 1 1 1 1 25 surfacesotthe dressed fstonejlalock` are thus111"1'1The111 ea1f117111g 1`1`Dl-l1t10f1he1`11leth0d Wthe Single 1 1 1Obtained automatically by thismeansso that the sflllatablehculll" SaWhaSthe advantage that surfaces, 1 before polishing,1111need 1only be gulp amachine `with an adjustable circular saw known 1 1 jected to a slighttreatmentby grinding. 1There 1 forother workcan be employed for carryingout 30111is therefore aconsiderablesaving of time and this process.11

expense in production. 1 j 1 11 1 The apparatus 1ior putting the methodinto 30 1 1 1 1 A few examplesof the invention are illustrated 1practice with two circular saws arranged at an 11 in the accompanyingdrawingsfinwhch 1 fangle to "one another is built in the following n1:liigurel is a side viewfoftheapparatus; 1 1 11 manner: 1 1 11 1 1` 1'1 35 111Figur`e'2 is a front view` of the apparatus; 1 1 On 1thestandards aand b, connected with one 35V 1 Figure 3 shows in sectontheattachment `of a 1 another ata suitable distance apart by transverse 11circular saw to its Spindle; 1 1 1 lmembers, a. horizontalbeam c isdisplaceable up 1 Figure is'fa partialfyiewof the main support- 1f anddowns vertical slide track by means of in`g1`slide side elevatlon; 1 1screwspindles d and e co-operating with a nut. 1` 1, 40 Figu1`6 5 1SFanmail from' V11 eW1 S1' 1OWmg a" 'Ihe vertical displacement iseectedby an elec-V 40 modifaplon 0f the mam Sjpportmg Shde when" tric motor gby means of bevel or worm gearing ff y twv 111101111651 Saw? efePfFVlded? 1 w The reuen lateral adjustment of the standard Figure 6 1sa' lde View of. a form of the app?" frame isleffected by mounting itupon rollers i ratus11for dressing both sides `of the block. of runningon mils h or by means of sliding car; 1

riages 1- displaced by `toothed 'racks or screw `45 1 The crust-cuttingiseflected in such a way that spindles manually by 'means of a handWheel k the `circular saw t makes the incisions A and the or by an lemlcmgtor' 1 1 verticalcircular saw 1;q makes the incisions B.` on thegmdmglbs of th? bear? ,c theresldes When both the cuts A1 and B extendthroughout 1 F0 and ffom a mam Supportm 51nd@ my hyd! au1- 150 1 theentire length of thestoneblock, the piece of man? Wen py meansofacylmder l and a Piston 1 1 crust c'1 bounded by thei cuts A 1and1Bfalls oi'l. 1",1W1'1h11an edlllteble feeding mOVement. On this`Thereupon the piece of1 crust D located beneath f mein SUDDQIHE Slideere arranged twolateral 1` 1 1 11 itis Iserved in a similar manner,` andthe same iSuppOr-tingslides 1t and 0, guided 1110IiZ0ntelly.1 1 1"Figure 'l is a plan view of `this embodiment.

with 'a working shaft p anda saw blade q', set in rotation by anelectric motor r.

yThe saw blade is secured in such a manner that no part of the spindleprojects on one side beyond the plane thatforms `the circle of movementof the outer coating. The wear of the saw blade on the periphery isallowed for by eccentrically mounting thework'ingshaft casing jp, sothat 'by rotating a worm wheel u, shown in Figure 4, the saw bladeq canbe adjusted'into a higher orv lower lposition.

On the second lateral slide o is slidably arranged the tool-holder inwhich'is `pivtally`"sup` ported the working 'shaft carrying the secondsaw bladeht, driven by an electric-motors. The fine adjustment of thissaw blade is effected by means of a screw spindle and'nt nth'e'l'ateralslide 0. l The arrangement of the two blades 1i-fandv `t"on l theiainslide .m1, is thereforey such that the inclined saw blad leadsAthe'"vQrtical saw blade p thalitting ,Cllr ation, hfd'dns'eqiietlyn thewgrkfpiecet ciittingfby thev inclined saw blade ,Therortioaof'tbaw' away@agricole or. in.1`ie ies ,with0ut damaging the cutting disc. After theyfvrwjar'i*cutthel main .slide mautcgmatically goes backI at the A'samelevel.

g 1s "cperation'by n an electric. time switch,

'tiletridge @descends aldistancef uarto the auf4 justedV cutting depth*o fI vthe blade;4 and'thework- Y si, "inglstrkekrecqmmeiices, rasefcn'd pieceflocated below Lthehfcrrner; being away'.

caribe attained a llustrated in FigiireTby proriding. a fait lateral"Supporting sudefwiih a rockable :worki 'haft casing., 'Then the timeIfit is desired tp cui: in lay' 'rsj'notinne' direq--tionhonly;butAtoand 'frog directions, this 'metrical relationship tothe rst, two lateral surfaces of the workpiece can be treatedsimultaneously. This arrangement -is illustrated inFigures 5 and 6. y

If the carriage carrying the work-piece is 10 "equipped with a turntableit is possible, without unclamping the work-piece, to treat two parallelsurfaces of the"s'tone, and then two side surfaces fait right anglesthereto, so that large work-pieces 'can Ybe automatically treated Veryaccurately and 15 quickly, the production of the lfinished blocks 'beingythereby considerably cheapened, While at thesame time the utmostaccuracy of the plane cut/surfaces can be ensured.

For work-pieces of less height, in order to 20 "cheapenithe machine, thebeam may be xedly supported, in which case 4the main-slide must besoarranged as/to beldisplaceable `in'.avertica1 direction. y l

Itisliliewise'possiblethough less (desirable, on 25 accuntbf the' greatlWeight 'of the work-pieces,

to""slide 'thecarriage to and' from automatically,

ywhile thefmainslide is displaceable ina Vertical direction. i

Having'now particularly" described" andascer- `'B0Vtainedll-,he'r'iature of tiny said" invention, and in what manner thesame is'to be "performed, I declare that' what I claim is:

mounting for stone clressingsawsv comprising a' 'supporting slide,l twolaterallsupporting slides35 "horizontally 'guided on the mst-mentionedsupporting slide. a saw `blade -and "motor unit mounted onahorizontalfaxison one ofY the lat- 'eralYA supporting slides for makingvertical cuts into the stone, and a sawbladeand =motor unitnm mountedonan oblique axis *on theother lateral supporting' slide' for makingoblique cuts 'into` 'the ''stone,tl"1e 'saw bladeandfmotorfunit/on theob- "lique'axisl 'beingmountedv in' 'front i of the f other saw' and4miotor unit in'l the cutting direction. 4-

OTTO WILHELM BURKHA-RDT.

